Application of Comprehensive Geophysical Prospecting Method in Water Accumulation Exploration of Multilayer Goaf in Integrated Mine

Table 1

Electrical parameters of coal and rock formation.

Lithology	Apparent resistivity (Ω·m)
Coal	220–460
Carbon mudstone	120–180
Gravel, conglomerate rock	180–280
Grit stone	140–240
Medium sandstone	115–220
Fine sandstone	90–180
Siltstone	60–120
Sandy mudstone	32–80